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The total cross section σT for orthopositronium (o-Ps) scattering from argon gas has been measured directly for the first time using a variable energy o-Ps beam in the range 16--95 eV. The cross section is found to rise from a value of approximately 9×10^-20 to 15×10^-20m² in the 16--30 eV range and thereafter decline slowly to 11×10^-20m² at the highest energy investigated. Comparison with theory suggests that the increase in σT is probably due to inelastic processes.
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Zafar et al. (1996) studied this question.
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